m8 it won't work if ya connect em all in series. the thing is gouki that every UPS battery has a certain discharge time.well by disassembling the UPS u can try sumthin like just using all the batteries in series just like u put cells into ur walkman but don't think that wud work. Well the best solution for u is 2 just get an inverter which wud provide u a backup for around about 6 hours depending upon its capacity and it gets automatically recharged when ur electricity comes back and stays on. the thing is inverters r a bit expensive but they r worth the cost.